I am after some suggestions about sleeves or long sleeved tops that offer UPF 50+, without being designed for 'extra warmth'. I'm in no danger of freezing, but I'm desperate to stave off sunburn. At the moment I have a variety of long-sleeved jerseys, which get quite hot, and a set of elasticised lycra sleeve thingies designed for golfers. Neither is perfect. Any ideas?